Metal hydroxides like aluminium trihydroxide (ATH) or magnesium dihydroxide (MDH) are commonly used halogen-free flame retardants in polyolefins.
化物如氢化铝（ATH）或氢化
（MDH）是常用的无卤阻燃
系。
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Right in the midst of this half-sad, half-sentimental reverie, she heard a familiar voice behind her say earnestly: " And allophite is the new hydrous silicate of alumina and magnesia, much resembling pseudophite, which Websky found in Silesia" .
就在这种半
悲
、半感的遐想中，她听到身后一个熟悉的声音恳切
：“
镁石一种新的氧化铝和氧化镁含水硅酸盐，很像韦伯斯基在西里西亚发现的假晶石。”
，
